Description

Varidiff trim incorporates two hemi-spherical control elements on opposite sides of the vane to reduce the pressure recovery particularly at low openings: a value of 0.9 is achieved compared with 0.7 for a standard vane. Further efficacy is achieved by adding an integral baffle. For higher openings the pressure drop is broken down across the vane and the baffle plate which results in a reduction in pressure recovery. The flow characteristic is equal percentage with a turn down in excess of 100:1. Due to the low dynamic torque a stable mode of operation is maintained 5 and 80 degrees opening.

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